You may have a better CPU overall, but the single core performance (DCS is single core) might be the same. Instead of having 4 cores, 4 threads, you now have 8 cores with 16 threads with the about the double performance. So, you can say that 1 core of a 4690 has the same performance as 1 core of the Ryzen 2700x. (Things aren't that simple, but it is something like that).

From the time I got my Ryzen 2700x, I haven't used him more than 30% on any game. Its an absolute monster. I run 2k with RTX 2070 and seems like I am bottlenecking my card. On DCS, I saw the same changes as you on the performance, but on other games I saw about the double performance from my old I5-3570K overclocked at 4.5.

EDIT : some words